122 lines
2.0 KiB
Go
122 lines
2.0 KiB
Go
package db
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import (
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"errors"
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"go.etcd.io/bbolt"
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)
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var _ KVStore = (*BboltDBKVStore)(nil)
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type BboltDBKVStore struct {
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db *bbolt.DB
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bucket *bbolt.Bucket
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bucketName string
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root bool
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dbPath string
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}
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func (b BboltDBKVStore) Open() error {
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if b.root && b.db == nil {
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db, err := bbolt.Open(b.dbPath, 0666, nil)
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if err != nil {
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return err
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}
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b.db = db
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}
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if b.bucket == nil && len(b.bucketName) > 0 {
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err := b.db.Update(func(txn *bbolt.Tx) error {
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bucket, err := txn.CreateBucketIfNotExists([]byte(b.bucketName))
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if err != nil {
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return err
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}
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b.bucket = bucket
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return nil
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})
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (b BboltDBKVStore) Close() error {
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if b.root && b.db != nil {
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err := b.db.Close()
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if err != nil {
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return err
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}
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}
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return nil
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}
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func (b BboltDBKVStore) Get(key []byte) ([]byte, error) {
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if b.root {
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return nil, errors.New("Cannot get from root")
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}
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var val []byte
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err := b.db.View(func(txn *bbolt.Tx) error {
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bucket := txn.Bucket([]byte(b.bucketName))
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val = bucket.Get(key)
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return nil
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})
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if err != nil {
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return nil, err
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}
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return val, nil
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}
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func (b BboltDBKVStore) Put(key []byte, value []byte) error {
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if b.root {
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return errors.New("Cannot put from root")
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}
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err := b.db.Update(func(txn *bbolt.Tx) error {
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bucket := txn.Bucket([]byte(b.bucketName))
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err := bucket.Put(key, value)
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if err != nil {
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return err
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}
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return nil
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})
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return err
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}
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func (b BboltDBKVStore) Delete(key []byte) error {
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if b.root {
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return errors.New("Cannot delete from root")
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}
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err := b.db.Update(func(txn *bbolt.Tx) error {
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bucket := txn.Bucket([]byte(b.bucketName))
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err := bucket.Delete(key)
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if err != nil {
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return err
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}
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return nil
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})
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return err
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}
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func (b BboltDBKVStore) Bucket(prefix string) (KVStore, error) {
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return &BboltDBKVStore{
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db: b.db,
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bucketName: prefix,
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root: false,
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}, nil
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}
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func NewBboltDBKVStore(dbPath string) *BboltDBKVStore {
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return &BboltDBKVStore{
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dbPath: dbPath,
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root: true,
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}
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}
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